"klaz" meaning in Breton

{
  "categories": [
    {
      "kind": "other",
      "name": "Formes de noms communs en breton",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Breton",
      "orig": "breton",
      "parents": [],
      "source": "w"
    }
  ],
  "forms": [
    {
      "form": "glaz",
      "tags": [
        "singular",
        "unmutated"
      ]
    },
    {
      "form": "glizi",
      "tags": [
        "plural",
        "unmutated"
      ]
    },
    {
      "form": "cʼhlaz",
      "tags": [
        "singular",
        "mutation-soft"
      ]
    },
    {
      "form": "cʼhlizi",
      "tags": [
        "plural",
        "mutation-soft"
      ]
    },
    {
      "form": "klizi",
      "tags": [
        "plural",
        "mutation-hard"
      ]
    }
  ],
  "lang": "Breton",
  "lang_code": "br",
  "pos": "noun",
  "pos_title": "Forme de nom commun",
  "senses": [
    {
      "form_of": [
        {
          "word": "glaz"
        }
      ],
      "glosses": [
        "Forme mutée de glaz par durcissement (g > k)."
      ],
      "id": "fr-klaz-br-noun-eT0PUa7J"
    }
  ],
  "sounds": [
    {
      "ipa": "\\ˈklɑːs\\"
    }
  ],
  "tags": [
    "feminine",
    "form-of"
  ],
  "word": "klaz"
}

{
  "categories": [
    "Formes de noms communs en breton",
    "breton"
  ],
  "forms": [
    {
      "form": "glaz",
      "tags": [
        "singular",
        "unmutated"
      ]
    },
    {
      "form": "glizi",
      "tags": [
        "plural",
        "unmutated"
      ]
    },
    {
      "form": "cʼhlaz",
      "tags": [
        "singular",
        "mutation-soft"
      ]
    },
    {
      "form": "cʼhlizi",
      "tags": [
        "plural",
        "mutation-soft"
      ]
    },
    {
      "form": "klizi",
      "tags": [
        "plural",
        "mutation-hard"
      ]
    }
  ],
  "lang": "Breton",
  "lang_code": "br",
  "pos": "noun",
  "pos_title": "Forme de nom commun",
  "senses": [
    {
      "form_of": [
        {
          "word": "glaz"
        }
      ],
      "glosses": [
        "Forme mutée de glaz par durcissement (g > k)."
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\ˈklɑːs\\"
    }
  ],
  "tags": [
    "feminine",
    "form-of"
  ],
  "word": "klaz"
}